[Freeciv-Dev] Tech cost patch v5

[Juha Litola <slave@xxxxxxxxxxxx>]

Overhauled things a bit ;)

Changes to v4:
- separated tech_cost_style to tech_cost_style and tech_leakage
- implemented reading costs from techs.ruleset. If some costs
  aren't entered, we'll calculate them using method 1.
- costs are now transferred to client
- costs are precalculated at server/ruleset.c
- modified game.ruleset files included
- added writing costs to rulesout.c

Only bugfix comments, please. I'll never get this in cvs, if I add more
features.

-- 
// Slave

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